Committee on National Security Systems
(CNSS) "Under Executive Order (E.O.) 13231 of October 16, 2001, Critical Infrastructure Protection in the Information Age, the President has redesignated the National Security Telecommunications and Information Systems Security Committee (NSTISSC) as the Committee on National Security Systems (CNSS). The Department of Defense continues to chair the committee under the authorities established by NSD-42. As a standing committee of the President's Critical Infrastructure Protection Board, the CNSS reports fully and regularly on its activities to the Board....The CNSS provides a forum for the discussion of policy issues, sets national policy, and promulgates direction, operational procedures, and guidance for the security of national security systems through the CNSS Issuance System."

Source:
http://www.nstissc.gov/html/overview.html